Part - A Wahda Co. incurred the following transactions during the month of January 2019. January 1: Beginning Inventory (50 units @ 10 per unit). January 10: Purchased 40 units @ 11 per unit. January 15: Sold 60 units @ 15 per unit. January 22: Purchase 60 units @ 12 per unit January 31: Sold 70 units @ 16 per unit. Required: Use FIFO" methods and calculate the following: (5 marks) a Calculate cost of ending inventory on January 31st, 2019 b. Calculate cost of goods sold for the period ending on January 31st, 2019 Note: You need to make a table showing the following columns to show your working: Date Purchases Cost of goods sold Inventory Balance Part-B What is the consistency principle as per financial reporting standards and why a company should follow this principle? For the toolbar, press ALT+F10 (PC) or ALT+EN+F10 (Mac)